ON HEREDITY IN BABBITS. 299 



8 extracted hybrids mated with 5 albinos produced 89 young, 

 of which 44 were normals and 45 were albinos ; the Mendelian 

 expectation for 90 young is 45 normals and 45 albinos. The 

 individual matiugs were as follows : — 



Table 18. 



Extracted Hybrids X Albinos {¥^). 



Matings. Normal. Albino. 



EH17XA2 2 1 



E H 17 X A 2 5 3 



E H 18 X y^ 2 2 3 



E H 18 X A 2 2 3 



E H 18 X A 2 1 3 



EH18XEA14 4 2 



E H 18 X A 2 4 1 



EH19XA2 2 3 



EH 19 X EA 14 1 4 



EH19XEA14 2 4 



E H 20 X A 2 3 1 



E II 21 X A 2 4 



E H 21 X A 2 2 3 



E H 21 X E A 14 3 4 



E H 33 X A 24 3 5 



EA34XEH37 2 4 



E A 39 X E H 41 2 1 



Total 44 45 



From the above results it would appear that the unit characters 

 normality and albinism in their heredity also follow the Mendelian 

 type Pisiim as regards dominance, segregation, and gametic 

 purity. 



(3) Coat Coloue. 



The grey coat of the common wild rabbit is made up for the 

 most part of yellow hairs based and tipped with black. The 

 extent of the coloured portions is somewhat variable in individual 

 hairs; generally, however, the black basal portion is more ex- 

 tensive than the yellow middle portion, while the black apical tip 

 is less. In these parti-coloured hairs both the yellow and black 

 pigments occur in diiferent dilutions. Thus, in the patch of short 

 fluffy hairs behind the ears the yellow portion of each hair is a 

 bright tan-yellow ; while along the back, towards the tail and 



